// In rare cases a strange hexadecimal output could happen,

// something like [I@2a139a55, in those cases just answer HEX

// This is a working program, indicate output for each (20) numbered line

int i = 3; // initialize your counter for this version of exam

int[] x = { 23, 8, 1, 15, 42, 8};

int[] w = new int[10];

System.out.println( i ); // 1.

System.out.println( x[2] ); // 2.

System.out.println( x[i]+2 ); // 3.

System.out.println( x[i+2] ); // 4.

System.out.println( x[i+2]); // 5.

System.out.println( w[i] ); // 6.

System.out.println( w[x[i]%10] ); // 7.

System.out.println( x[w[i]%10] ); // 8.

System.out.println( x[i/2] ); // 9.

System.out.println( x[i]/2 ); // 10.

System.out.println( x ); // 11.

System.out.println(Arrays.toString(x)); // 12.

// The following will take some time to figure out!!!

for (i=0; i<10; i++)

w[i]=(int)Math.min(x[i%6],x[(i+1)%6]);

System.out.println(i); // 13.

System.out.println(Arrays.toString(w)); // 14.

System.out.println(Arrays.toString(x)); // 15.

// Trace what happens in the array Mystery method below

int[] aaa = {0, 1, 2, 3, 4};

arrayMystery(aaa);

System.out.println(Arrays.toString(aaa)); // 16.

System.out.println(arrayMystery(aaa)); // 17.

System.out.println(Arrays.toString(aaa)); // 18.

System.out.println(arrayMystery(aaa)); // 19.

System.out.println(Arrays.toString(aaa)); // 20.

// used for #16-20

public static int arrayMystery(int[] list) {

for (int i = 0; i < list.length; i++) {

list[i] = i * list[i];

}

return list[list.length/2];

}

// NEW PROGRAM (Chapter 8)

// 10 pts per problem (21-30), even though some are very easy, others tough!

public static void main(String[] args) {

// When we're done here, the code below runs without errors.

// Attached is the Rectangle Class from Practice-IT!

Rectangle rect1 = new Rectangle(10, 10, 20, 30);

Rectangle rect2 = new Rectangle(5, 5, 5, 5);

// 21. Although we're NOT going to make a Graphic here, DO SKETCH

// these two rectangles rect1 and rect2 as they might appear

// on DrawingPanel, or just your mental concept to help with below

// Write expected output for the following

System.out.println(rect1); // 22.

System.out.println(rect2); // 23.

System.out.println(rect1.getWidth()); // 24.

System.out.println(rect1.getHeight()); // 25.

System.out.println(rect1.contains(0,0)); // 26.

// 27. On attached, write default constructor setting all fields to (0,0,0,0)

Rectangle rect0 = new Rectangle();

// 28. On attached paper, write mutators to allow changing width as shown below:

rect0.setWidth(1);

rect0.setHeight(2);

// 29. Also write a mutator to allow setting height of a Rectangle object.

// 30. Write a boolean touches method in the Rectangle Class that tells us if

// two rectangles touch each other, meaning they overlap at any point(s)

System.out.println( rect0.touches(rect1) ); // false

System.out.println( rect1.touches(rect2) ); // true

}

}

// A solution that works for PRACTICE-IT Rectangle Exercise

public class Rectangle {

// Fields

private Point p;

private int width;

private int height;

// Constructs a new rectangle whose top-left corner is specified by

// the given coordinates and with the given width and height.

public Rectangle(int x, int y, int w, int h) {

p = new Point(x,y);

width = w;

height = h;

}

// ACCESSORS

public int getHeight() {

return height;

}

public int getWidth() {

return width;

}

public int getX() {

return p.x;

}

public int getY() {

return p.y;

}

// Returns a string similar to "Rectangle[x=42,y=42,width=42,height=42]".

public String toString() {

return "Rectangle[x="+p.x+",y="+p.y+",width="+width+",height="+height+ "]";

}

// from Practice-IT Exercise solutions

// Determines if a Point is within this Rectangle

public boolean contains(int xTest, int yTest) {

return (xTest>=p.x && xTest<=p.x+width && yTest<=p.y+height && yTest>=p.y);

}

public boolean contains(Point other) {

return this.contains(other.x,other.y);

}